The navigatesuccess event of the Navigation interface is fired when a successful navigation has finished.

In the case of an intercepted navigation, this would occur after any promises returned by your intercept() handler are fulfilled. The NavigationTransition.finished promise will also fulfill at the same time.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("navigatesuccess", (event) => {});

onnavigatesuccess = (event) => {};

A generic Event.

You might deal with a successful navigation by hiding a previously displayed progress indicator, like this:

navigation.addEventListener("navigatesuccess", (event) => {
  loadingIndicator.hidden = true;
});

Or you might show an error message on failure:

navigation.addEventListener("navigateerror", (event) => {
  loadingIndicator.hidden = true; // also hide indicator
  showMessage(`Failed to load page: ${event.message}`);
});

• Modern client-side routing: the Navigation API
• Navigation API explainer
• Domenic Denicola's Navigation API live demo